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/*
 * Copyright (c) 2008-2024, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.client.impl.connection.tcp;

import com.hazelcast.client.impl.clientside.HazelcastClientInstanceImpl;
import com.hazelcast.client.impl.connection.ClientConnection;
import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.client.impl.protocol.codec.ClientPingCodec;
import com.hazelcast.client.impl.spi.impl.ClientInvocation;
import com.hazelcast.internal.networking.Channel;
import com.hazelcast.internal.util.Clock;
import com.hazelcast.logging.ILogger;
import com.hazelcast.spi.exception.TargetDisconnectedException;
import com.hazelcast.spi.impl.executionservice.TaskScheduler;

import java.util.concurrent.ConcurrentMap;

import static java.util.concurrent.TimeUnit.MILLISECONDS;

/**
 * Periodically on each `heartbeatInterval` pings active connections.
 * Connections not receiving any packages for `heartbeatTimeout` duration
 * is closed with {@link TargetDisconnectedException}.
 */
public final class HeartbeatManager {

    private HeartbeatManager() {
    }

    public static void start(HazelcastClientInstanceImpl client,
                             TaskScheduler taskScheduler,
                             ILogger logger,
                             long heartbeatIntervalMillis,
                             long heartbeatTimeoutMillis,
                             TcpClientConnectionManager connectionManager) {

        HeartbeatChecker heartbeatChecker = new HeartbeatChecker(client,
                logger,
                heartbeatIntervalMillis,
                heartbeatTimeoutMillis,
                connectionManager);

        taskScheduler.scheduleWithRepetition(heartbeatChecker, heartbeatIntervalMillis, heartbeatIntervalMillis, MILLISECONDS);
    }

    private static final class HeartbeatChecker implements Runnable {

        private final HazelcastClientInstanceImpl client;
        private final ILogger logger;
        private final long heartbeatIntervalMillis;
        private final long heartbeatTimeoutMillis;
        private final TcpClientConnectionManager connectionManager;

        private HeartbeatChecker(HazelcastClientInstanceImpl client,
                                 ILogger logger,
                                 long heartbeatIntervalMillis,
                                 long heartbeatTimeoutMillis,
                                 TcpClientConnectionManager connectionManager) {
            this.client = client;
            this.heartbeatTimeoutMillis = heartbeatTimeoutMillis;
            this.heartbeatIntervalMillis = heartbeatIntervalMillis;
            this.connectionManager = connectionManager;
            this.logger = logger;
        }

        @Override
        public void run() {
            long now = Clock.currentTimeMillis();
            for (ClientConnection connection : connectionManager.getActiveConnections()) {
                check(connection, now);

                // Check TPC channels as well, if they exist
                Channel[] tpcChannels = connection.getTpcChannels();
                if (tpcChannels != null) {
                    for (Channel tpcChannel : tpcChannels) {
                        check(tpcChannel, connection, now);
                    }
                }
            }
        }

        private void check(ClientConnection connection, long now) {
            if (!connection.isAlive()) {
                return;
            }

            if (now - connection.lastReadTimeMillis() > heartbeatTimeoutMillis) {
                logger.warning("Heartbeat failed over the connection: " + connection);
                connection.close("Heartbeat timed out",
                        new TargetDisconnectedException("Heartbeat timed out to connection " + connection));
                return;
            }

            if (now - connection.lastWriteTimeMillis() > heartbeatIntervalMillis) {
                sendPing(connection);
            }
        }

        private void check(Channel tpcChannel, ClientConnection connection, long now) {
            if (tpcChannel.isClosed() || !connection.isAlive()) {
                return;
            }

            if (now - tpcChannel.lastReadTimeMillis() > heartbeatTimeoutMillis) {
                String message = "Heartbeat failed over the TPC channel: " + tpcChannel + " for connection: " + connection;
                logger.warning(message);
                connection.close("Heartbeat timed out", new TargetDisconnectedException(message));
                return;
            }

            if (now - tpcChannel.lastWriteTimeMillis() > heartbeatIntervalMillis) {
                ConcurrentMap attributeMap = tpcChannel.attributeMap();
                ClientConnection adapter = (ClientConnection) attributeMap.get(TpcChannelClientConnectionAdapter.class);
                sendPing(adapter);
            }
        }

        private void sendPing(ClientConnection connection) {
            ClientMessage request = ClientPingCodec.encodeRequest();
            ClientInvocation invocation = new ClientInvocation(client, request, null, connection);
            invocation.invokeUrgent();
        }
    }
}